The best thing you can do is accept he will have interests that you don't and that's fine. You can always explore things together. What a great way to bond. Just remember to have fun with him. He will take you places you never thought you would explore. How exciting is that?
I love this! I definitely never thought I would have any interest in dinosaurs, let alone all their names, what period they are from, herbivore versus carnivore, etc., but it has been something DS6 and I have learned about together over the years and it really has been a great bonding opportunity!